The peptide enhances production of keratin, a protein that is a major component of hair, according to Symrise.

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The fibres in feathers are almost entirely composed of keratin, a protein also found in hair and nails.

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Rhino horn is made of keratin, a tough protein found in human fingernails.

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Phylogenetic analyses show that these proteins belong to different keratin lineages that originated in an early tetrapod ancestor and in mammals evolved to become the major keratin types of hair.

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When heated in the absence of oxygen (a process called pyrolysis), keratin forms hollow tubular structures six millionths of a metre across and riddled with microscopic pores, much like carbon nanotubes.

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